Revised mount structure to reduce the structure-bone noise in bone-conduction earphone

摘要

Bone-conduction earphone was used to transfer sound information by exciting the temporal bone in human using uniaxial exciter. Most of bone-conduction device was implemented on a glass structure and sound leakage can be found at attached position due to insufficient anti-vibration mount module supporting the uniaxial exciter. In this paper, negative stiffness concept was used in mount module to minimize the structure-bone leakage sound in glass structure by change the location of uniaxial exciter. The model of bone-conductor was built including the uniaxial exciter and the proper location of mount module as well as the required dynamic stiffness were determined from the simplified model. Test setup regarding the mounted uniaxial exciter was prepared and the performance of proposed mount module was evaluated from the response data, transmissibility and sound pressure.